LP3872ESX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3872ESX-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable 3.3V power delivery in space-constrained designs.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	5 mA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3872ESX-3.3 are qualified based on the following critical parameters that must remain constant across all alternatives:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Maximum input voltage: 7V
Package type: TO-263 (DDPAK-5)
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Variations in voltage dropout, quiescent current, and supply current are permitted within the scope of functional equivalence, as these parameters do not affect the core voltage regulation and current delivery specifications. All substitute parts maintain identical electrical output characteristics and mechanical compatibility with the original design.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout @ 1.5A	Quiescent Current (Iq)	Supply Current (Max)	RoHS Status	Packaging	Inventory
LP3872ESX-3.3	Texas Instruments	Obsolete	0.55V	5 mA	15 mA	RoHS non-compliant	Bulk	1900 Pcs
LP3852ESX-3.3/NOPB	Texas Instruments	Active	0.38V	3 mA	10 mA	ROHS3 Compliant	Tape & Reel (TR)	2351 Pcs
LP3855ESX-3.3/NOPB	National Semiconductor	Active	0.38V	3 mA	10 mA	Not specified	Bulk	1700 Pcs
LP3872ESX-3.3/NOPB	Texas Instruments	Active	0.55V	5 mA	15 mA	ROHS3 Compliant	Tape & Reel (TR)	1529 Pcs
LP3875ESX-3.3/NOPB	National Semiconductor	Active	0.55V	5 mA	15 mA	Not specified	Bulk	1412 Pcs
LP3962ESX-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	2300 Pcs
LP3965ESX-3.3/NOPB	National Semiconductor	Active	0.55V	9 mA	15 mA	Not specified	Bulk	2783 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the LP3872ESX-3.3. Selection should prioritize active product status parts to ensure long-term availability and supply chain stability.

For new designs and production requiring RoHS3 compliance, the following active alternatives are available: LP3852ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, and LP3962ESX-3.3/NOPB from Texas Instruments. The LP3852ESX-3.3/NOPB offers improved performance characteristics with reduced voltage dropout (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA), resulting in decreased power dissipation in battery-powered or thermally constrained applications.

For applications where the original electrical characteristics must be preserved exactly, LP3872ESX-3.3/NOPB provides an active equivalent with identical dropout voltage and quiescent current specifications, available in Tape & Reel packaging for automated assembly.

National Semiconductor alternatives (LP3855ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3965ESX-3.3/NOPB) provide functional equivalence with the same output specifications and package type, with varying quiescent current and dropout characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-3.3/NOPB be used as a direct replacement for LP3872ESX-3.3?

A: Yes. Both parts deliver 3.3V at 1.5A in TO-263 (DDPAK-5) packages with identical protection features and operating temperature ranges. The LP3852ESX-3.3/NOPB is an active product with improved dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA), making it functionally superior for most applications.

Q: What is the difference between LP3872ESX-3.3 and LP3872ESX-3.3/NOPB?

A: Both parts are electrically identical with matching output voltage, current, dropout, and quiescent current specifications. The primary difference is product status: the original LP3872ESX-3.3 is obsolete, while LP3872ESX-3.3/NOPB is active. The /NOPB variant includes RoHS3 compliance and is available in Tape & Reel packaging for production environments.

Q: Are National Semiconductor parts (LP3855, LP3875, LP3965) compatible with Texas Instruments designs?

A: Yes. All substitute parts maintain identical output voltage (3.3V), output current (1.5A), input voltage rating (7V max), and TO-263 (DDPAK-5) package specifications. They provide equivalent protection features and operating temperature ranges, ensuring mechanical and electrical compatibility in existing designs.

Q: Which substitute part has the lowest power dissipation?

A: LP3852ESX-3.3/NOPB exhibits the lowest power dissipation characteristics with voltage dropout of 0.38V and quiescent current of 3 mA, compared to the original 0.55V dropout and 5 mA quiescent current.

Q: What packaging options are available for production?

A: LP3852ESX-3.3/NOPB and LP3872ESX-3.3/NOPB are available in Tape & Reel (TR) packaging for automated assembly. LP3962ESX-3.3/NOPB is available in Cut Tape (CT) & Digi-Reel® format. Bulk packaging is available for all alternatives.

Q: Are all substitute parts RoHS compliant?

A: Texas Instruments alternatives (LP3852ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3962ESX-3.3/NOPB) are ROHS3 compliant. RoHS status for National Semiconductor parts is not specified in available documentation.

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